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A146464
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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 7, 21, 55, 263, 1645, 13423, 126629, 1447199, 21743065, 415978809, 9965909653, 303132585251, 11591760284391, 555704916934105, 33613901189599473, 2574475177790739409
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